20549538 has 24 divisors (see below), whose sum is σ = 46174128. Its totient is φ = 6849684.

The previous prime is 20549537. The next prime is 20549563. The reversal of 20549538 is 83594502.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20549533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20656 + ... + 21627.

It is an arithmetic number, because the mean of its divisors is an integer number (1923922).

Almost surely, 2^20549538 is an apocalyptic number.

20549538 is an abundant number, since it is smaller than the sum of its proper divisors (25624590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20549538 is an equidigital number, since it uses as much as digits as its factorization.

20549538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42300 (or 42288 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 20549538 is about 4533.1598251110. The cubic root of 20549538 is about 273.9054587075.

The spelling of 20549538 in words is "twenty million, five hundred forty-nine thousand, five hundred thirty-eight".